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Debt - Narrative (Details)		12 Months Ended
	Jan. 23, 2017 USD ($) $ / shares	Dec. 31, 2019 USD ($) securitization	Dec. 31, 2018 USD ($) securitization	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Pledged assets		$ 44,030,000	$ 56,795,000
Number of residential CDO securitizations | securitization		3	3
Net investment in residential securitization trusts		$ 4,900,000	$ 4,800,000
Proceeds from issuance of convertible notes		0	0	$ 126,995,000
Residential collateralized debt obligations
Debt Instrument [Line Items]
Collateralized debt obligations		$ 40,400,000	$ 53,000,000.0
Weighted average interest rate (as a percent)		2.41%	3.12%
6.25% senior convertible notes due 2022 | Convertible Notes
Debt Instrument [Line Items]
Face amount	$ 138,000,000.0
Proceeds from issuance of convertible notes	$ 127,000,000.0
Cost of debt, percentage	8.24%
Discount and deferred charges, net		$ 5,000,000.0	$ 7,200,000
Effective interest rate	96.00%
Interest rate	6.25%
Convertible note, conversion ratio	0.1427144
Conversion price (in dollars per share) | $ / shares	$ 7.01
ARM Loans
Debt Instrument [Line Items]
Loans pledged as collateral		47,200,000	60,200,000
Adjustable Rate Residential Mortgage | Residential collateralized debt obligations
Debt Instrument [Line Items]
Pledged assets		$ 44,000,000.0	$ 56,800,000

X

- Definition

Represents Company’s net investment in the residential securitization trusts, which is the maximum amount of the Company’s investment that is at risk to loss and represents the difference between (i) the carrying amount of the mortgage loans and real estate owned held in residential securitization trusts and (ii) the amount of Residential CDOs outstanding.

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Debt Instrument, Issuance Percentage of Face Amount

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Number of Residential Collateralized Debt Obligation Securitizations

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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